Evaporating device



No. 626,759. Patented lune [3, I899.

11. T. .msuu. I EVAPUBATING DEVICE.

(Application flhd my 4, 1897.)

(No Model.)

Inventor Attorney Witnesses UNITED STATES PATENT OFFICE.

OMAR T. JOSLIN, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF TO THE BLACK & OLAWVSON COMPANY, OF HAMILTON, OHIO.

EVAPORATING DEVICE.

SPECIFICATION forming part of Letters Patent No. 626,759, dated June 13, 1899. Application filed May 4, 1897. Serial No. 635,096. (No model.)

To all whom, it may concern.-

Be it known that I, OMAR T. JOSLIN, of New York, New York county, State of New York, have invented certain new and useful Improvements in Apparatus for Thickenin g Liquids, of which the following is aspecification.

This application pertains to a novel device for thickening liquids by changing the temperature of the liquid by subjecting it to the action of a thermal agent to extract the contained moisture, and, further, to a novel apparatus for carrying out such method.

My present improvement will be readily understood from the followin g description,taken in connection with the accompanying drawings, in which- Figure 1 is a side elevation, part vertical section, of a machine, exemplifying myinvention; and Fig. 2, an end elevation thereof, part in vertical section.

In the drawings, 1 indicates a vat adapted to receive the liquid to be dealt with; 2, the upper surface of the liquid therein; 3, a hollow metallic cylinder mounted in suitable bearings and dipping the lower portion of its periphery into the liquid in the vat; 4, inletpipe for the thermic fluid or liquid into the cylinder; 5, outlet-pipe for the thermic fluid or liquid from the cylin der,the inlet and outlet pipes being illustrated as communicating with the interior of the cylinder through its opposite end journals; 6, a gear upon one of the necks of the cylinder to exemplify means by which the cylinder may be rotated by power; 7, an inlet float-valve for admitting to the vat the liquid to be dealt with, the float engaging the liquid in the vat, and 8 a ductor engaging the peripheryof the cylinder at a point over the liquid in the vat at that side of the cylinder approaching the liquid-that is to say, the ductor is in operative proximity to the face of the cylinder as close to the surface of the liquid as is consistent with the performance of its function, which is to remove a film from the face of the cylinder and to return it to the vat to prevent the film from being carried beneath the surface of the liquid while attached to the cylinder, the purpose of all of which will appear more fully hereinafter.

9 indicatesa roller bearing on the periphery of the cylinder at a point between the ductor and the liquid in the vat Where the cylinder moves from the liquid, this roller in the example being carried in swinging arms, so as to be capable of being moved out of engagement with the cylinder; 10, a handle serving as a latch to hold roller 9 in contact with the cylinder and to permit of the roller being disengaged from the cylinder; 11, an adjustable spring between the latch and the roll-bearings to serve in endowing the roll-pressure with elasticity, and 12 an outlet-pipe for use in emptying the vat.

Assume that the liquid to be dealt with is glue-liquor, or that it is the so-called tankwater of the packing-house from which it is desired to get the solid ammoniate, or that it is a salt solution from which the salt is wanted, or that it is Waste soap-lyes, or that it is fanning extract. The liquid portion of the matter is to be gotten out by evaporation, leaving a thicker liquid or a solid. In such case in the use of my machine steam or other hot fluid or liquid is to be passed into and through the cylinder. Assume steam to be employed as the thermal fluid in the cylinder. The hot cylinder is setin motion in the direction of the arrow and the liquid to be dealt with is introduced at valve 7, the float maintaining the level of the liquid at such point that the lower portion of the cylinder will dip slightly into the liquid. The cylinder as it turns in the liquid in the vat will become wetted or coated thereby. As the coated surface of the cylinder travels upwardly out of the tank the heat of the cylinder causes the lighter liquid portions of the matter to evaporate from the coating, the vapor going to the atmosphere and leaving a comparatively dry coating upon the cylinder. This coating is scraped from the cylinder by ductor 8, which returns it to the vat, where it joins the liquid therein, the cylinder thus continuing to act on the matter in the vat by evaporating from it its lighter liquid portions, the matter in the vat thus getting continually thicker, the operation being continued until the desired degree of consistency or solidity is obtained.

As the lighter matter is evaporated away by the action of the cylinder the quantity of matter in the vat tends to become less, this lessening of mass being more pronounced at the ICO . cylinder having ceased to lessen the mass in the vat. The thickened material may then be removed from the vat through outlet 12 or otherwise.

The facility with which the hot cylinder transmits heat to the wetted coating brought up from the vat is dependent largely upon the perfection of contact between that coatingand the hot surface of the cylinder. In dealing with many kinds of liquid it is found that air or gas bubbles formunder the coating, thus to that extent insulating the coating from thesurface of the cylinder. It is the duty of the roller 9 to flatten down or rupture these bubbles and press the coating into perfect contact with the cylinder-surface.

Since the successful operation of theapparatus is dependent upon the perfection or continuity of contact between the coating or film and the surface of the cylinder and since this perfection of contact is brought about by the re-forming of the film under the action of the roller, it follows necessarily-that the roller must be brought to bear upon the cylinder at or immediately beyond that point at which the blistering of the film ceases, as-it is man-ifestly essential that the film shall not, again become distorted after havin g been re-formed and as the-very nature of the method requires a maximum exposure of perfectly-contacted film to produce a machine of maximum effectiveness, The distortion or'blistering of the film as it is raised from the body of liquid 6o\rying'011t of the method.

the roller is placed at that point at which the. distortion of the film ceases and that the ducwithin the vat is caused by its sudden change of temperature, resulting in the formation andexpausion of bubbles of air or gas between the film and the heated surface and generated from the moisture contained in the film by the sudden application of heat. It follows naturally that at some point (determined by the temperature of the cylinder and liquid and by the consistency of the latter) a comparative equality of temperatures will be produced in the film and cylinder which will preclude the possibility of further distort-ion of the film. It is at this'pointthat the roller is brought to bear to reform the film and to restore that perfection and continuity of contact which is essential to the successful car- W'e have seen that tor-plate is placed as close to the bodyof liquid upon the side of the cylinder oppositethe roller as is possible consistent with the proper performance of its function. It simply re- ,portions of the mass. liquid to be dealt with is oil or lard to be thickened by abstracting heat from it. .such case the liquid will be supplied to the ,tank as before; but the 'th'ermic fluid or liquid supplied within the cylinder will be mains to call attention to the fact that these relative positions of these elements are necessary to obtain a maximum area of film in perfect contact with the cylinder and subjected to the action of the thermal agent.

' In the examples of liquids above referred to the thickening of the liquid was eifected i by the addition of heat to it, the heat resulting in the evaporation of the lighter liquid coldas, for instance, refrigerated air or refrigerated Water or brine. The rotating cylinder takes up liquid from the vat in the form of a coating on the cylinder, heat becoming transferred from that coating to the metal of the cylinder and to the thermic agent withi n the cylinder, resulting in solidification of the coating upon the cylinder. This coating becomes scraped off by the ductor and returned to'the vat, the cylinder continuing to act upon the mass in the vat until the thermic agent passing through the cylinder has carried away such heat from the mass in the vat as to result in the desired degree of solidification.

I claim as my invention 1. An apparatus for thickeningliquids comprising a vat, a film-carrier, means for subjecting a film to the action of a thermal agent by contact with the surface of the carrier, film-re-forming means at the point where the I distortion of said film ceases, and means for removing the film from the carrier beyond the film-re-forming means.

2. An apparatusfor thickeningliquids comprising a vat, a rotary heating-cylinder having av portion of its periphery extending into the Vat and a roller urged into-yielding contact with the cylinder at a point at which the distortion of a film, raised from the vat upon the surface of the cylinder, ceases, substantially as specified.

3.. An apparatus for thickening liquids comprising a vat designed to contain a body of I liquid, a rotary heating-cylinder having a portion only of its periphery extending within the vat and designedto be immersed in the contained liquid, a roller extending across and urged into yieldingcontact with the face of the cylinder at a point where the distortional' efiect of the heat upon a film, lifted from the vat by the cylinder, ceases, and a stationary ductor extendin g across and in contact with the face of the cylinder at a point adjacent to that at which it enters the vat, substantially as specified.

OMAR T. JOSLIN.

Witnesses:

E. J. SCHRODER, SAM D. Frrron, J r.

Assume now that the 

